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[SOLVED] Email addresses etc in signature

So I'm trying to format an HTML signature but the editor seems to not like any links except http ones. I tried to put a mailto: link in but i end up with http:// stuck in front automatically. eg mailto:blah@blah.com becomes http://mailto:blah@blah.com

I haven't got to my skype:// link but I expect the same to happen.

Is this the expected behavior? Am I doing something wrong? Or is a bug worthy of being logged?